Willaed l



W. L. BUNDY.

Calendar Clock-Movement.

Patented Mar. 30,1880.

HF H1 1911 515/. Tlwwoom/ UNITED STATES PATENT OFFICE.

WILLARD L. BUNDY, OF AUBURN, NEW YORK.

CALENDAR-CLOCK MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 225,968, dated March 30, 1880.

Application filed August 6, 1879.

To all whom it may concern Be it known that I, WILLARD L. BUNDY, of Auburn, in the county of Cayuga and State of New York, have invented certain new and useful Improvements in Calendar-Clock Movements and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification.

My invention relates to an improved means for actuating the calendar mechanism directly from the hour-hand shaft or time-movement of a clock.

As the hour hand axle mades two revolutions to every twenty-four hours, and as the calendar-movement is to be actuated but once during the same interval of time, it has been found difficult to connect these parts by a simple, compact, and easily-operated mechanism without materially changing the construction of an ordinary clock. This has heretofore been done by means of a single convolutioncam peculiarly constructed or connected to gearing, or otherwise, by double gearing.

My improvement essentially consists in providing a peculiarly-formed double-convolution spiral cam, which may be secured upon the hour-hand axle or sleeve of the clock, and which will actuate a drop-lever that imparts motion to the calendar mechanism at each second revolution of the hour-handle axle, as will hereinafter more fully appear.

In the accompanying drawings, Figure 1 is a front elevation of an ordinary time-clock pro- "ided with a calendar-actuatin g cam, lever, and rod, and with its dial and case-door removed. Fig. 2 is a vertical section of Fig. 1 through the hands-arbor. Fig. 3 is a detached perspective view of the calendar-operating cam and droplever. Fig. at is a vertical section, similar to Fi 2, showing a portion of the clock-movement and modification of the cam. Fig. 5 is a detached perspective view of said modification cam and drop-lever.

A clock-movement, A, of ordinary construction, is secured to its case B, and is provided with a bracket-plate, C, that is attached di-- rectly to the front plate, a, of the clock, so as to project on one side between the said front plate, a, and the dial-plate of the clock. A

lever, D, is pivoted to the plate 0 at c, and in this instance extends toward and above the hour-hand axle.

The spiral cam E is placed upon the hourhand axle or sleeve and securely connected thereto, and forms a continuous track, going twice around the said axle. This cam is preferably formed of two plates or disks of sheet metal perforated in the center, and each plate is split on a radial line and spirally twisted, so that the right-hand split edge of the front leaf will join the left-hand split edge of the back leaf, and when both are soldered to the same sleeve or barrel 0 will form a continuous spiral thread or leaf. The inner extremity, E of this spiral forms a cam, which extends radially beyond the circumference of the outer portion of the front disk.

The said projecting cam, which is shown clearly in Figs. 2 and 3, is outwardly curved, so as to have its extreme outer point project directly above and in the same vertical plane with the outer or initial portion of the spiral leaf.

The moving end of the lever D is provided with a forked end, (I, that straddles over and rests upon the spiral leaf of the cam E, and is also connected at a suitable distance from the end (I to clear the cam with the connecting-rod F of the calendar mechanism, which is arranged in any suitable or well-known manner in the lower portion of the clock-case. The lever D will thus rest upon the initial end E of the cam'E, and follow its spiral leaf until the shaft has made nearly two revolutions, when the moving end of the lever will be raised vertically to the terminal overlapping end E of the cam, and when released therefrom, at the end of the second revolution of the cam, will drop directly down upon the initial portion of the cam, to repeat the former operation. The initial end of the cam is provided with a guard-plate, e, to prevent the lever from falling outside the cam altogether, and guide it to its track.

In the modification of the spiral (shown in Figs. 4 and 5) the cam or projecting portion E of said spiral is not bent over the front leaf of the cam, as above described, and in order to return the lever D to the initial portion of the cam at E the lever is so pivoted to the bracket-plate O at c, and sprung, that it will normally tend to fall upon the portion E of the cam. As it is made of spring metal it will yield laterally and follow the spiral movement of the track until the forked end d is released from the terminal end of cam, and then spring back to its normal position in a direction parallel to the arrow 1, Fig. 4, and drop upon the initial portion of the cam at E, as described.

The lever D may extend entirely across the hour-hand axle and cam E, and be connected at its extremity with the connecting-rod F, as shown in Figs. 4 and 5, or may only partially project across and above the cam, as shown in the other figures of the drawings.

From the above description it will be seen that as the hour-wheel sleeve makes two rcvolutionsin twenty-four hours, the cam will cause the lever D to be elevated once in the same time, which, through its connecting-link, will operate the indicators of the calendar, moving them to indicate one day ahead.

The cam above described is compact and simple in construction, and when used in connection with its drop-lever may be applied to an ordinary clock-movement directly to the hour-hand sleeve, between the front plate and dial-plate of the clock, without chang ing its parts or varying its mechanism, and through it a calendar attachment will be operated accurately. The same double-convolution cam and lever can be used, in connection with a clock-movement, to operate other devices requiring also to be actuated only once in twenty-four hours, and the drop-lever of the above-described device be connected therewith in a suitable manner.

Having now fully described my invention, I claim 1. In a calendar -clock, the combination, with the hour-hand axle or sleeve of a clockmovement, of a spiral worm having a continuous double convolution, with a cam, E for giving one impulse to the calendar mechanism for each two revolutions of the hour-hand axle, substantially as and for the purpose described.

2. The combination of the hour-hand axle of a clock-movement, a spiralworm cam having a double convolution, a drop-lever pivoted to an arm attached to the front plate of the movement and operated by said cam, and a link pivoted to said drop-lever, substantially as and for the purpose described.

3. The combination, with the hour-hand axle of a clock-1noven ient,of a spiral-worm cam having a continuous double convolution, the terminal end E of which is curved to come directly over and above the initial end of the cam-track, and the pivoted drop-lever operated thereby and carrying a connecting-rod, substantially as and for the purpose described.

\VILLARD L. BUNDY.

Witnesses:

CHAs. OBRIEN, A. G. TREAT. 

